CBSE Class 12 Biology Human Reproduction MCQs Set 06

Question: Which part of ovary in mammals acts as an endocrine gland after ovulation?
a) Stroma
b) Germinal epithelium
c) Vitelline membrane
d) Graafian follicle
Answer: d

Question: Which of the statements is correct?
a) hCG, hPL and relaxin are produced in women only during pregnancy
b) During pregnancy the levels of other hormones like estrogens, progestogens, cortisol, prolactin, thyroxine, etc., are increased several-fold in the maternal blood
c) Increased production of these hormones is essential for supporting the fetal growth, metabolic changes in the mother and maintenance of pregnancy
d) All of the above
Answer: d

Question: Which one of the following is the correct matching of the events occurring during menstrual cycle?
a) Proliferative phase: rapid regeneration of myometrium and maturation of Graafian follicle
b) Secretory phase: development of corpus luteum and increased secretion of progesterone
c) Menstruation: breakdown of myometrium and ovum not fertilised
d) Ovulation: LH and FSH attain peak level and sharp fall in the secretion of progesterone
Answer: b

Question: In a mammalian sperm, spirally arranged mitochondria around the axial filament are present in the region of –
a) Head
b) Middle piece
c) Principal piece of tail
d) End piece of tail
Answer: b

Question: Spermatids are changed into spermatozoa through –
a) Spermiogenesis
b) Spermiation
c) Spermatogenesis
d) Spermatosis
Answer: a

Question: The structure formed after release of ovum from Graafian follicle and secretory in nature is –
a) Corpus callosum
b) Corpus luteum
c) Corpus albicans
d) Corpus stratum
Answer: b

Question: _______ is the hormone responsible for the expression of secondary sex characteristics in human females.
a) Testosterone
b) Estrogen
c) FSH
d) LH
Answer: b

Question: Tunica albuginea covers –
a) Penis
b) Testis
c) Ovule
d) Stroma
Answer: b

Question: Path of sperms from penis to the site of fertilization is –
a) Oviduct → Uterus → Cervix → Vagina
b) Vagina → Cervix → Uterus → Oviduct
c) Vagina → Uterus → Oviduct → Cervix
d) Vagina → Oviduct → Cervix → Uterus
Answer: b

Question: Which of the following statements concerning menopause is correct?
a) Menopause occurs because all of the female’s follicles become hormone-producing corpus luteum at once.
b) Menopausal symptoms are a result of a decrease in the production of FSH and LH.
c) The onset of menopause is primarily due to follicle atresia.
d) Menopause will occur when a female has only about 250,000 follicles left in her ovaries.
Answer: c

Question: Ovulation takes place by
a) FSH
b) LH
c) Progesterone
d) Estradiol
Answer: b

Question: Clitoris in mammals is
a) Homologous to penis
b) Analogous to penis
c) Functional penis in female
d) Non-functional penis in male
Answer: a

Question: Number of spermatozoan, a single primary spermatocyte produces in spermatogenesis, is
a) One
b) Two
c) Four
d) Eight
Answer: c

Question: An accessory genital gland is
a) Seminal vesicle
b) Cowper’s gland
c) Prostate gland
d) All of these
Answer: d

Question: Corpus luteum produces
a) Estradiol
b) Testosterone
c) Progesterone
d) None
Answer: c

Question: Which one is primary sex organ?
a) Scrotum
b) Penis
c) Testis
d) Prostate
Answer: c

Question: Foetal ejection reflex in human female is induced by
a) Release of oxytocin from pituitary
b) Fully developed foetus and placenta
c) Differentiation of mammary glands
d) Pressure exerted by amniotic fluid
Answer: b

Question: A human female has the maximum number of primary oocytes in her ovaries
a) At birth
b) Just prior to puberty
c) Early in her fertile years
d) Midway through her fertile years
Answer: a

Question: In which part of the female reproductive anatomy does a fetus develop?
a) Vagina
b) Ovary
c) Uterus
d) Cervix
Answer: c

Question: Human placenta is derived from
a) Ectoderm
b) Trophoblast
c) Endoderm
d) Mesoderm
Answer: b

Question: Which of the following signaling molecules is responsible for erectile function?
a) Acetylcholine
b) Nitric oxide
c) Dopamine
d) Carbon dioxide
Answer: b

Question: All tissues can be formed from
a) Ectoderm
b) Endoderm
c) Mesoderm
d) Stem cells
Answer: d

Question: Withdrawal of which hormone is the immediate cause of menstruation?
a) Estrogen
b) FSH
c) FSH-RH
d) Progesterone
Answer: d

Question: Gametes are formed during
a) Spermatogenesis
b) Oogenesis
c) Gametogenesis
d) Spermogenesis
Answer: c

Question: The cavity of gastrula is called
a) Blastocoel
b) Coelom
c) Archenteron
d) Haemocoel
Answer: c

Question: A gland associated with the male reproductive organs of mammals is
a) Prostate gland
b) Phallic gland
c) Mushroom gland
d) Conglobate gland
Answer: a

Question: Human testes are positioned in an external sac rather than in the abdominal cavity
a) To shorten the distance that semen must travel during ejaculation
b) To shorten the distance that sperm must swim during insemination
c) So the testes can be kept away from the urinary bladder
d) So the testes can be kept cooler than the body’s interior
Answer: d

Question: Why can’t a woman get pregnant again during pregnancy?
a) A woman ovulates during pregnancy, but the oviducts are plugged with protective mucus to prevent sperm from entering.
b) High levels of HCG in women’s bodies kill sperm.
c) A woman can’t have intercourse during pregnancy due to the presence of a protective mucus plug that develops in the cervix.
d) High levels of estrogen and progesterone, secreted by the corpus luteum or placenta during pregnancy, inhibit the secretion of gonadotropins and prevent ovulation.
Answer: d

Question: The fluid that provides energy for the sperm cells comes from the ___
a) Urethra
b) Bulbourethral glands
c) Prostate gland
d) Seminal vesicles
Answer: d

Question: Select the incorrect match.
(a) Seminiferous tubules:
Each lobule contains one to three highly coiled Seminiferous tubules in which sperms are produce. These open into the vasa efferentia through rete testis.
(b) Fallopian tube:
The fallopian tube is about 10-12 cm. long and extend from the periphery of each ovary to the uterus.
(c) Semen:
At least 60% sperms must have normal shape and size and at least 40% of them must show vigorous motility. The seminal plasma along with the sperms constitute the semen.
(d) Secondary ovarian follicle
Primary follicle gets surrounded by more layers of granulosa cells to become secondary follicles. In the secondary ovarian follicle, the theca layer is organized into an outer theca internal and an inner theca externa.
Answer: c

Question: Which of the following events occurs at the same time that menstruation is beginning?
(a) The levels of LH and FSH are “spiking.”
(b) The levels of estrogen and progesterone in the ovarian hormone cycle are on the rise
(c) The corpus luteum is degenerating
(b) Ovulation is occurring
Answer: c

Question: Diaphragms are contraceptive devices used by females. Choose the correct option from the statements given below:
I. They are introduced into the uterus.
II. They are placed to cover the cervical region.
III. They are an example of physical barriers.
IV. They act as spermicidal agents.
(a) I and II
(b) I and III
(c) II and III
(d) III and IV
Answer: c

Question: In the absence of fertilisation which of the following statements is most apt?
A. No menstruation occurs
B. Menstruation take place
C. Corpus luteum degenerates
D. Endometrium disintegrates
E. New cycle initiates
Options –
(a) A is false
(b) A and E are false
(c) A, B and D are true
(d) C, D and E are false
Answer: a